Chapter 15 Firewall Mode Overview

Transparent Mode Overview

7.The security appliance performs NAT by translating the mapped address to the real address, 10.1.2.27.

An Outside User Visits a Web Server on the Inside Network

Figure 15-10shows an outside user accessing the inside web server.

Figure 15-10 Outside to Inside

Host

Internet

209.165.201.2

Management IP 209.165.201.6

209.165.201.1

209.165.200.230

Web Server

209.165.200.225

92409

The following steps describe how data moves through the security appliance (see Figure 15-10):

1.A user on the outside network requests a web page from the inside web server.

2.The security appliance receives the packet and adds the source MAC address to the MAC address table, if required. Because it is a new session, it verifies that the packet is allowed according to the terms of the security policy (access lists, filters, AAA).

For multiple context mode, the security appliance first classifies the packet according to a unique interface.

3.The security appliance records that a session is established.

4.If the destination MAC address is in its table, the security appliance forwards the packet out of the inside interface. The destination MAC address is that of the downstream router, 209.186.201.1.

 

Cisco Security Appliance Command Line Configuration Guide

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OL-12172-01

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Cisco Systems OL-12172-01 manual An Outside User Visits a Web Server on the Inside Network, 15-14

OL-12172-01 specifications

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